CN204233927U - Combined type cyclone demist dust pelletizing system - Google Patents

Abstract

The utility model relates to a combined cyclone demisting and dust removal system, which comprises an absorption tower and a clean flue which are connected successively. The tower is also provided with a cyclone, the cyclone is located above the spray layer, and the spray layer is located above the original flue gas inlet. The utility model has high purification efficiency of dust removal and mist removal, especially can efficiently remove tiny particles below 5 microns in the flue gas. Under the same purification rate, the energy consumption of the system is far lower than that of the wet electrostatic precipitator, which reduces the operating cost; in addition, the system The installation only needs to use the original absorption tower space for transformation without changing the external structure of the absorption tower, which effectively solves the problems of occupied space, difficulty, long transformation period, high initial investment and operation costs caused by the transformation of electrostatic precipitator, and the operation process is simple Optimized, stable and reliable, suitable for popularization and application in the fields of deep purification of flue gas in industries such as coal combustion, fuel oil, and solid waste treatment.

Description

Combined cyclone demist and dust removal system

technical field

The utility model relates to a combined cyclone demist and dust removal system, in particular to the technical field of demist and dust removal in flue gas wet desulfurization and purification.

Background technique

At present, there are many treatment technologies for industrial flue gas and tail gas pollution. Wet desulfurization and denitrification technologies, which mainly treat sulfur-containing and nitrogen-containing pollutants, are relatively mature and representative technologies. This wet treatment technology includes limestone -Gypsum method, ammonia method, double alkali method, etc. In the above-mentioned specific wet flue gas treatment technologies, it is necessary to install a mist eliminator to remove the tiny droplets generated during the spraying process after spray washing and purification. In order to enhance the demisting effect, different types of mist eliminators are used respectively. However, neither the flat plate demister nor the roof demister can effectively remove droplets, dust and other tiny particles with a particle size of less than 5 μm, especially the sulfate, sulfite, and other aerosols that constitute PM2.5. The removal efficiency of tiny particles such as nitrate and nitrite is difficult to meet the environmental protection requirements. In order to further enhance the treatment effect and meet the requirements of environmental protection, post-processing devices have begun to appear, that is, wet electrostatic precipitators are installed at the back end of wet desulfurization devices and then moderately purified. Although wet electrostatic precipitators can improve the effect of removing tiny particles, However, because the wet electrostatic precipitator process equipment itself is bulky, takes up a lot of space, high investment cost, and high energy consumption in operation, it is difficult to retrofit and promote the application of existing wet flue gas treatment projects.

Therefore, in order to meet the growing environmental protection needs, it is urgent to develop technologies that can efficiently and deeply purify flue gas.

Utility model content

The purpose of this utility model is to provide a combined cyclone demist and dust removal system for the problems existing in the existing wet flue gas purification treatment technology, and make full use of the existing flue gas purification treatment system equipment such as wet desulfurization and denitrification to optimize and integrate , realize efficient and deep purification of flue gas, enhance environmental protection effect at low cost, reduce loss of energy materials, and save occupied space.

The technical scheme for solving the problem of the utility model is: a combined cyclone demist and dust removal system, which includes an absorption tower and a clean flue connected in sequence, and a raw flue gas inlet is arranged on the side of the absorption tower, and the absorption tower A spray layer is arranged in the tower, wherein a cyclone is also arranged in the absorption tower, the cyclone is located above the spray layer, and the spray layer is located above the raw flue gas inlet.

Further, in the combined cyclone demister and dust removal system of the present invention, a demister is arranged above the cyclone; preferably, there are multiple groups of demisters, and the multiple groups of demisters are placed on The absorption tower is arranged sequentially from bottom to top; the mist eliminator is a laminate type mist eliminator or a roof type mist eliminator.

Further, in the combined cyclone demist and dust removal system of the present invention, there are multiple sets of cyclones, and the multiple sets of cyclones are arranged in sequence from bottom to top in the absorption tower, and the multiple sets of cyclones are connected in series layout.

Further, in the combined cyclone demist and dust removal system of the present invention, the cyclone includes blind plates, blades and partition tubes interconnected from the inside to the outside; there are multiple blades; the blind plates are arranged on the center of the cyclone.

Preferably, in the combined cyclone demist and dust removal system of the present invention, there are multiple sets of partition tubes, and the multiple sets of partition tubes are arranged on the support beam with the blind plate as the center ring; the multiple sets of partition tubes The plate tubes are in the shape of concentric rings; a plurality of vanes are arranged between the adjacent partition tubes, and the plurality of vanes are combined and arranged in concentric circles around the blind plate.

Preferably, in the combined cyclone demist and dust removal system of the present invention, the blades between the adjacent partition tubes are arranged obliquely and uniformly arranged in a ring shape.

Preferably, in the combined cyclone demist and dust removal system of the present invention, the cyclone is located 1 to 3 meters above the spray layer; the inclination angle of the blade relative to the cross section of the cyclone is Between 20° and 60°, the projection overlap rate of the blades is between -20% and +50%, and the distance between the adjacent partition tubes is 0.15 meters to 1.5 meters; the height of the partition tubes The diameter of the blind plate is 0.1m to 1m; the diameter of the blind plate is 0.5m to 5m; wherein, the projection overlap ratio is (overlapping area of all blade orthographic projections-gap area between all blade orthographic projections)/all blade orthographic projections The sum of the projected areas.

Preferably, in the combined cyclone demist and dust removal system of the present invention, a support device for supporting the cyclone is provided on the inner wall of the absorption tower; the support device is a support lug, and the support lug and the support beam connected.

Preferably, in the combined cyclone demist and dust removal system of the present invention, the blade is made of any one of acid-resistant stainless steel, carbon steel coated with glass flake anticorrosion layer, glass fiber reinforced plastic, PP and PVC; It is composed of any one of acid-resistant stainless steel, carbon steel coated with glass flake anti-corrosion layer, glass steel, PP and PVC.

The utility model also provides a combined cyclone defogging and dust removal process, which includes the following steps:

(1) Flue gas spray purification

In the absorption tower, the purifying agent slurry is sprayed through the spray layer, and the descending purifying agent slurry is in countercurrent contact with the ascending flue gas to purify the flue gas;

(2) Cyclone demist and dust removal treatment

The flue gas obtained after purification in step (1) goes up into the cyclone, and in the cyclone, the cyclone demisting and dust removal treatment is carried out;

(3) The clean flue gas processed in step (2) goes up through the clean flue for discharge.

Further, in the step (3), the clean flue gas processed in the step (2) goes up and is demisted by the demister and then discharged from the clean flue.

Further, in the step (1), the purification agent is a desulfurization agent, or a denitrification agent, or a mercury removal agent.

Further, in the step (2), the cyclone includes blind plates, blades and baffle tubes interconnected from the inside to the outside, the upward flue gas meets the continuously rotating blades, and the various particles in the flue gas The direction of movement is changed and accelerated, and the small water droplets and tiny particles in the flue gas form turbulence and fully collide with each other, collide with each other and agglomerate into large droplets, and the large droplets are in contact with the wall of the partition tube and the liquid film on the wall Combined, the tiny particles in the flue gas are removed.

Further, in the step (2), multiple sets of cyclones are used to perform cyclone demist and dust removal treatment, and multiple sets of baffle tubes are continuously rotated to form an airflow vortex, so that the flue gas is fully purified, and the All kinds of particles in the flue gas accelerate the differentiation, and quickly gather and condense into large droplets after leaving the cyclone. After falling, they dissolve into the liquid film on the wall of the partition wall, and then flow down into the spray layer, and then follow the spray Enter the slurry tank at the bottom of the absorption tower for recovery.

The combined cyclone demist and dust removal system of the utility model is obtained by installing and transforming the absorption tower on the basis of the existing wet flue gas treatment device, without taking up additional space and without any mutual influence. Among them, the existing Wet flue gas treatment devices are mainly wet desulfurization systems, such as limestone calcium desulfurization systems, ammonia desulfurization systems, and double-alkali desulfurization systems. And a wet flue gas treatment device combined with wet desulfurization, denitrification and demercury. Applying the combined cyclone demisting and dust removal system of the utility model for flue gas treatment can effectively remove tiny droplets, fine dust particles, aerosols and other tiny particles in the flue gas with low energy consumption and low system resistance, and greatly increase the amount of fine particles in the flue gas. The removal efficiency, the dust removal efficiency can reach below 5mg/Nm ³ .

Compared with the prior art, the beneficial effect of the utility model is that the purification efficiency of dust removal and mist removal is high, especially the fine particles below 5 μm such as fine liquid droplets, fine dust particles and aerosols in the flue gas can be efficiently removed. In the case of high efficiency, the energy consumption of the system is much lower than that of the wet electrostatic precipitator, which reduces the operating cost; in addition, the system setting only needs to use the original absorption tower space for transformation, without changing the external structure of the absorption tower, which effectively solves the problem of electrostatic precipitator transformation. Problems such as high space requirements, high difficulty, long renovation period, high initial investment and high operating costs are caused, and the operation process is simple and optimized, with high stability and reliability. It is suitable for coal, oil, gas, thermal power plants, metallurgy, chemical industry, Promotion and application of flue gas deep purification related fields in solid waste (garbage) treatment and other industries.

Description of drawings

Fig. 1 is the longitudinal sectional structure schematic diagram of the combined cyclone demisting and dedusting system of the present invention;

Fig. 2 is the structural schematic diagram of the longitudinal section of the cyclone of the combined cyclone demisting and dedusting system of the present invention;

Fig. 3 is a top view of the cyclone of the combined cyclone demist and dust removal system of the present invention.

As shown in the figure: 1-absorption tower, 2-original flue gas inlet, 3-cyclone, 4-spray layer, 5-mist eliminator, 6-clean flue, 7-blade, 8-baffle tube, 9-blind plate, 10-support beam, 11-support ear.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described.

Example 1

As shown in Figure 1, a combined cyclone demist and dust removal system includes an absorption tower 1 and a clean flue 6 connected in sequence, the original flue gas inlet 2 is provided on the side of the absorption tower 1, and a There is a spray layer 4, wherein a cyclone 3 is also provided in the absorption tower 1, the cyclone 3 is located above the spray layer 4, and the spray layer 4 is located above the original flue gas inlet 2.

In the above embodiment, in order to ensure the demist and dust removal effect, as shown in Figure 1, a demister 5 is arranged above the cyclone 3; the number of the demister 5 is preferably multiple groups, and the multiple groups The mist eliminators 5 are arranged sequentially from bottom to top in the absorption tower; the mist eliminators 5 are laminate type mist eliminators or roof type mist eliminators; the number of specific mist eliminators 5 is designed according to actual working conditions.

In the above embodiment, in order to ensure the effective removal of particles below 5 microns, there are multiple sets of cyclones 3, and the multiple sets of cyclones 3 are sequentially arranged in the absorption tower 1 from bottom to top. The multiple sets of cyclones 3 It is arranged in series; as shown in Figure 1, the 3 rooms of each group of cyclones are arranged in series up and down through the axis. The specific number of cyclones 3 is designed according to specific working conditions. If multiple sets of cyclones 3 are arranged in series, there is no need to install additional mist and dust removal equipment such as demisters 5 .

When applying the combined cyclone demist and dust removal system of the utility model to carry out the treatment of flue gas demist and dust removal, the following steps are included:

(1) Flue gas spray purification

In the absorption tower 1, the cleaning agent slurry is sprayed through the spray layer 4, and the downward cleaning agent slurry is in countercurrent contact with the upward flue gas to purify the flue gas;

(2) Cyclone demist and dust removal treatment

The flue gas purified by step (1) goes up into the cyclone 3, and in the cyclone 3, the air flow vortex is generated by the operation of the cyclone 3, so that the various particles in the flue gas change the direction of movement and accelerate the movement, and the small water droplets in the flue gas The turbulent flow and the tiny particles are formed and fully collided with each other, colliding with each other and agglomerating into large droplets. The large droplets contact the wall of the cyclone 3 and merge with the liquid film on the wall, and then flow down into the spray layer, and then As the spray enters the slurry tank at the bottom of the absorption tower for recovery, the tiny particles in the flue gas are removed, and the cyclone demist and dust removal treatment is realized;

(3) The clean flue gas processed in step (2) goes up through the clean flue 6 for discharge.

In the demist and dust removal treatment process of the above-mentioned combined cyclone demist and dust removal system, in the step (3), in order to ensure the treatment effect, the clean flue gas after the treatment in the step (2) goes up through a group of demisters 5 or multiple sets of mist eliminators 5 are discharged from the clean flue after demisting.

In the fog removal and dust removal treatment process of the above-mentioned combined cyclone fog removal and dust removal system, in the step (1), the purification agent is a desulfurization agent, or a denitrification agent, or a mercury removal agent, such as limestone, ammonia water, ammonium salt wait.

Adopting the utility model for flue gas demist and dust removal treatment can greatly enhance the overall environmental protection effect, save floor space, save energy, save economic costs, and greatly improve the dust removal efficiency, which can reach below 5mg/Nm ³ .

Example 2

As shown in Figures 1 to 3, the basic settings and application of a combined cyclone demist and dust removal system are the same as in Example 1. In order to enhance the effect of demist and dust removal and improve the efficiency of flue gas purification, the following settings are also included:

The cyclone 3 includes a blind plate 9 , blades 7 and a partition tube 8 interconnected from the inside to the outside; there are multiple blades 7 ; the blind plate 9 is arranged at the center of the cyclone 3 .

In the above embodiment, in order to ensure the effect of fog and dust removal and the safety and stability of the system operation, a support device for supporting the cyclone 3 is provided on the inner wall of the absorption tower 1; the blade 7 is made of acid-resistant stainless steel, coated glass Any one of carbon steel, glass fiber reinforced plastic, PP and PVC of the flake anticorrosion layer; the partition tube 8 is made of any one of acid-resistant stainless steel, carbon steel, glass fiber reinforced plastic, PP and PVC coated with glass flake anticorrosion layer .

When the above-mentioned combined cyclone demist and dust removal system is used for flue gas treatment, the basic method is the same as that of Embodiment 1, wherein, the upward flue gas meets the continuously rotating blade 7, and the wet flue gas forms a gas-liquid two-phase in the cyclone 3 and above it. The movement direction of various particles in the flue gas is changed and accelerated, and the small water droplets and tiny particles in the flue gas form turbulence and fully collide with each other, collide with each other and agglomerate into large droplets. The wall of the cylinder is in contact with and fused with the liquid film on the wall, so that the tiny particles in the flue gas are removed. Preferably, the system is provided with multiple sets of cyclones. In the step (2), the cyclone demisting and dust removal process is carried out through multiple sets of cyclones, and multiple blades 7 between multiple sets of partition tubes 8 arranged up and down Continuous rotation forms multi-layer airflow vortices with different heights, which fully purifies the flue gas and accelerates the differentiation of various particulate matter in the flue gas. The liquid film on the wall surface of the plate cylinder 8, and then flows down into the spray layer 4, and then enters the slurry pool at the bottom of the absorption tower 1 with the purification agent sprayed for recovery.

Example 3

As shown in Figures 1 to 3, the basic setting and application of a combined cyclone demist and dust removal system are the same as in Embodiment 2. In order to enhance the demist and dust removal effect, the following settings are also included: in the cyclone 3, the partition There are multiple groups of cylinders 8, and multiple groups of partition cylinders 8 are set on the support beam 10 with the blind plate 9 as the center ring; the multiple groups of partition cylinders 8 are concentric rings; There are a plurality of blades 7 arranged in concentric circles around the blind plate 9 ; on the inner wall of the absorption tower 1 there are supporting lugs 11 , and the lugs 11 are connected to the supporting beams 10 .

In order to enhance the removal effect of tiny particles, the blades 7 between the adjacent partition tubes 8 are arranged obliquely and evenly arranged in a ring shape, so as to facilitate the differentiation of particles in the upstream wet flue gas, and further facilitate the complete removal. remove.

In the above embodiment, in order to enhance the effect of demisting and dust removal, specific settings are made according to the specific flue gas conditions. Preferably, the cyclone 3 is located 1 to 3 meters above the spray layer 4. Preferably, the cyclone 3 The bottom is 2 meters apart from the top of the spray layer 4; the inclination angle of the blade 7 relative to the cross section of the cyclone 3 is between 20° and 60°, preferably, the inclination angle is 40°; the projection of the blade 7 The overlap rate is between -20% and +50%, preferably, the projection overlap rate is 30%; the distance between adjacent partition tubes 8 is 0.15 meters to 1.5 meters, preferably, the adjacent partition tubes The distance between 8 is 0.8 meters; the height of the partition tube 8 is 0.1 m to 1 m, preferably, the height of the partition tube 8 is 0.6 m; the diameter of the blind plate 9 is 0.5 m to 5 m, preferably , the blind plate 9 has a diameter of 2 meters.

Using the above-mentioned embodiments of the utility model to carry out the purification treatment of flue gas demisting and dust removal greatly enhances the overall environmental protection effect, especially can effectively remove tiny particles below 5 μm such as fine liquid droplets, fine dust particles, and aerosols in the flue gas, and the removal efficiency reaches 3 mg/Nm ³ .

The utility model is not limited to the above-mentioned embodiments, and any obvious improvements or changes made by those skilled in the art to the above-mentioned embodiments will not exceed the concept of the utility model and the scope of protection of the appended claims.

Claims (8)

1. A combined cyclone demisting and dedusting system, comprising an absorption tower and a clean flue connected successively, the side of the absorption tower is provided with the former flue gas inlet, and a spray layer is provided in the absorption tower, It is characterized in that a cyclone is also provided in the absorption tower, the cyclone is located above the spray layer, and the spray layer is located above the original flue gas inlet. 2. The combined cyclone demist and dust removal system according to claim 1, characterized in that: a demister is arranged above the cyclone. 3. The combined cyclone demister and dust removal system according to claim 2, characterized in that: the demisters have multiple groups, and the multiple groups of demisters are sequentially arranged in the absorption tower from bottom to top; The mist eliminator described above is a laminate type mist eliminator or a roof type mist eliminator. 4. The combined cyclone demist and dust removal system according to claim 1, characterized in that: there are multiple groups of cyclones, and the multiple groups of cyclones are sequentially arranged in the absorption tower from bottom to top, and the multiple groups Groups of cyclones are arranged in series. 5. The combined cyclone demist and dust removal system according to any one of claims 1 to 4, characterized in that: the cyclone includes blind plates, blades and partition tubes interconnected from inside to outside; There are multiple blades; the blind plate is arranged at the center of the cyclone. 6. The combined cyclone demist and dust removal system according to claim 5, characterized in that: there are multiple sets of partition tubes, and the multiple sets of partition tubes are set on the support beam with the blind plate as the center; The plurality of sets of separator tubes are concentric rings; A plurality of vanes are provided between adjacent partition tubes, and the plurality of vanes are combined and arranged in concentric circles around the blind plate. 7. The combined cyclone demist and dust removal system according to claim 6, characterized in that: the blades between the adjacent partition tubes are arranged obliquely and evenly arranged in a ring shape. 8. The combined cyclone demist and dust removal system according to claim 6, characterized in that: the cyclone is located 1 to 3 meters above the spray layer; The inclination angle of the blade relative to the cross-section of the cyclone is between 20° and 60°, and the projection overlap ratio of the blade is between -20% and +50%; The distance between the adjacent partition tubes is 0.15 meters to 1.5 meters; The height of the partition tube is 0.1 meter to 1 meter; The diameter of the blind plate is 0.5m-5m.